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  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 1

    Seamless MPLS for Mobile Backhaul dra$-li-mpls-seamless-mpls-mbh-00

    Zhenbin Li, Lei Li (Huawei) Manuel Julin Lpez Morillo (Vodafone)

    Tianle Yang (China Mobile) Luis M. Contreras(Telefonica I+D)

    IETF 90, Toronto, Canada

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 2

    Updates

    nChange the dra$ name from dra$-li-mpls-seamless-mpls-mbb-00 to dra$-li-mpls-seamless-mpls-mbh-00

    nAdd one co-author: Luis from Telefonica I+D nRemove the soluMons for seamless MPLS for mobile backhaul network. Please refer to the related soluMons dra$s.

    nAdd detailed problem statement and define corresponding requirements.

    nCorrect text errors.

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 3

    Seamless MPLS Network Architecture

    nThe key concepts for Seamless MPLS: Decoupling the transport layer and service layer. nThe network will be divided into mul@ple IGP areas for access, aggrega@on and core network

    nIBGP run among the Area Boarder Routers (ABRs) to adver@se labeled route. nLDP DoD is introduced to set up LSP on demand between AN and AGN.

    Access Aggregation Access Aggregation Core

    AGN LSR ABR LSR ABR LSR AGN

    RR IS-IS L1 LDP

    IS-IS L2 LDP

    IS-IS L1 LDP

    AN AN

    AGN LSr ABR LSR ABR LSR AGN

    ISIS ABR Loop-Back

    ISIS ABR Loop-Back

    IBGP IBGP IBGP IBGP

    Static Route LDP DoD Static Route LDP DoD

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 4

    Seamless MPLS for Mobile Backhaul Networks nRing topology is adopted in mobile backhaul networks. nVariable devices with variable capability are deployed in the access ring and aggregaMon ring.

    nL3VPN and TE propose new requirements on Seamless MPLS architecture.

    Transport Layer

    LDP/TE LSP BGP LSP

    Hierarchical BGP LSP

    Service Layer

    L2/L3 Services

    Next-Hop self Next-Hop self

    Last Mile Access Aggrega@on Core

    RSG

    RSG

    CSG

    BTS

    eNB

    NodeB

    BSC

    ASG

    ASG

    RNC

    S-GW/MME

    CSG

    CSG

    CSG

    CSG

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 5

    Scenarios for Network Architecture

    nNetwork Architecture 1: Network separated by Ases Scenario 1: ASes connected by different ASBRs Scenario 2: ASes connected by integrated ASBRs

    nDifferent network integrated in one AS but separated by different IGP areas

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 6

    Scenarios for Different Edge of Labeled BGP

    nScenario 1: Cell Site/User PE devices as the edge nScenario 2: ASG nodes as the edge n Scenario 3: RSG(ASBR) devices as the edge

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 7

    Scalability problems and requirements

    nProblem statement lTunnel/LSP ConfiguraMon

    a set of TE a`ributes configuraMon at the ingress node

    lPath Constraints ConfiguraMon Return Path Issue of BFD for MPLS LSPs Completely disjointed primary and backup LSP Avoid passing through different access rings

    nRequirements lREQ 01:Auto tunnel mechanism lREQ 02: cope with the return path issue of BFD lREQ 03: completely disjointed primary and backup LSP lREQ 04: avoid traffic passing through different access rings

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 8

    End-to-End Transport problems and requirements

    nProblem statement lProxy Egress MPLS TE LSP

    Actual desMnaMon may be not located in the local MBH network set up the proxy egress MPLS TE LSP from CSG to sMtching point

    lMulM-hop LDP DoD cannot configure the default route for setup of LDP DoD LSP troublesome to configure staMc routes to a specific desMnaMon on all node

    nRequirements lREQ 11:set up MPLS TE proxy egress LSP to sMtch with BGP LSP lREQ 12:simplify route configuraMon to setup mulM-hop LDP DoD LSP

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 9

    Hierarchical Service Bearing problems and requirements

    nProblem statement

    lOwing to the limited capability of access nodes it may be necessary to introduce hierarchical MPLS-based service bearing

    lSeamless MPLS is to provide more flexibility for MPLS-based service bearing.

    nRequirements lREQ 31: hierarchical L3VPN soluMons MAY be introduced lREQ 32: hierarchical L2VPN soluMons MAY be introduced

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 10

    Reliability Transport problems and requirements

    nProblem statement lThe route loop is common in the ring lLFA can not avoid the route loop completely lRemote-LFA has to set up LDP remote session and sMll faces the route loop challenges

    nRequirements lREQ41:Scalable IP/LDP FRR soluMons SHOULD be provided for the purpose of 100% network coverage

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 11

    Policy Control problems and requirements

    nProblem statement lSimple and dynamic BGP policy design and configuraMon lBGP is asked to carry more informaMon to help select rouMng more intelligently

    nRequirements lREQ51: BGP SHOULD be able to carry more informaMon to facilitate the route policy control

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 12

    OAM problems and requirements (1)

    nProblem statement lLayering OAM Framework for L3VPN Service

    The exisMng OAM mechanisms for IP and L3VPN is not sufficient to saMsfy the OAM requirement of the mobile service, especially for

    performance monitoring

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 13

    OAM problems and requirements (2)

    nProblem statement lFlat End-to-End OAM Mechanism

    Can not get the end-to-end path directly. Path of OAM packets and real traffic packets may be different

    nRequirements lREQ61: Performance monitoring mechanism for IP flow lREQ62: Performance monitoring mechanism for the VPN flow lREQ63: The end-to-end path trace mechanism for the IP flow

  • dra$-li-mpls-seamless-mpls-mbh-00 IETF 90 MPLS 14

    Next Steps Solicit more comments and feedback Incorporate more requirements and soluMons Revise the dra$

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